'Real Housewives of Orange County' Star Sabotages Cast-Mate, Causes Injury

On "The Real Housewives of Orange County," Heather threw a party to celebrate the groundbreaking of her new mega-mansion. Naturally, it was hoedown themed, because, why not?

And what's a hoedown without a mechanical bull? Each of the ladies took a spin on the ride, but Tamra's didn't go so well.

As soon as the bull bucked Tamra off, she yelled out in pain, saying she thought she broke her arm. Heather denied having any involvement with the bull's speed, saying she would fire the ride operator for turning it up so high ... but we all know who told him to do that.

HEATHER: "Yeah, turn that up."

Tamra left the party and rushed to urgent care. Thankfully, her arm wasn't broken – just badly bruised.

Gossip and Gab was left scratching their head -- why did Heather lie?

TV Fanatic seemed to give Heather the benefit of the doubt, suggesting the so-called sabotage could've been creative editing. Maybe.